When fish oil is exposed to air or high temperatures, it may begin to oxidize, resulting in color changes, such as turning yellow or brown, and the quality may be reduced; Fish oils with higher purity are usually refined and purified, so they are lighter in color and free of impurities. On the contrary, dark fish oil may be due to low purity or impure products; The purer the omega-3 in fish oil, the lighter its color is usually higher.
High-quality fish oil is usually transparent or yellowish in color and has a bright color. Darker fish oil may mean that it is not pure, or that it is not pure. The color of fish oil is related to its quality, and lighter fish oil is usually defatted and purified, so it contains fewer impurities, so it appears crystal clear.
We generally use Gardner color scale to describe the color of fish oil, Gardner color scale is a one-dimensional measure of color shade, the number is generally from 1 to 18, the higher the number means the darker the color. Gardner's high-color fish oil may contain more impurities, such as oxidized fatty acids, etc., while low-color fish oil is usually degreased and purified, resulting in fewer impurities and higher purity.
SH810 Automatic Petroleum Product Colorimeter is a professional instrument for liquid color measurement with unique design microcomputer control technology, compact and portable design, novel and unique, suitable for laboratory and field use. Gardner color scale: cobalt chloride solution, ferric chloride solution, potassium chloroplatinate solution are mixed in different proportions as standard chromaticity, and the general value is between 1-18. It is suitable for colors that are darker yellow or brown than platinum cobalt. It meets the standard of "GB T22295-2008 Transparent Liquid Color Determination Method (Gardner Colorimetry)".
Principle: The specimen is placed in a glass test tube with an inner diameter that meets the standard, and the color of the specimen is visually compared with the Gardner glass color scale, and the color of the specimen is indicated by a color mark that is closest to the color of the specimen.
Procedure: Compare the specimen to the glass standard by pouring the specimen into a glass tube to determine the standard number that is closest to the brightness and saturation of the color.